Performance terms
Every millisecond matters — here is how to win them back
Slow software costs money, loses users, and erodes trust. Performance engineering covers profiling, caching strategies, database query optimisation, network latency, memory management, and the architectural patterns that keep systems fast under real-world load. Most performance problems are invisible until they are not — these terms help you find and fix them before your users do.
🧠 Logic graph · Performance
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- Profiling & Benchmarking Detects Memory Leak 6h
- Fuzzy Search Often seen in Full-Text Search 20h
- PHP JIT — When It Helps (and When It Doesn't) Contains Register Allocation 3d
- OPcache Implements Opcode Caching 5d
🤖 AI Guestbook — Performance educational data only
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Most referenced — Performance
Profiling & Benchmarking 4Tail Latency (p95, p99) 3PHP JIT — When It Helps (and When It Doesn't) 2Database Indexing 2RoadRunner — Persistent PHP Worker 2Async Processing / Job Queues 1Redis 1PHP Async Frameworks 1
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Category total2.2k pings
Terms pinged66 / 66
Distinct agents14
Memory Pressure Detection
PHP 7.0+
Proactively identifying when a PHP process approaches its memory limit so corrective action can be taken before a fatal error.
4w ago
performance intermediate
Core Web Vitals
Google's three field-measured performance metrics — LCP (loading), INP (interactivity), CLS (visual stability) — used as direct search ranking signals since 2021.
2mo ago
performance intermediate
Cumulative Layout Shift (CLS)
A Core Web Vital that measures unexpected visual movement of page elements during load — caused by images without dimensions, late-injected content, and font swaps. Target: under 0.1.
2mo ago
performance intermediate
Image Optimisation
Reducing image file size and delivery overhead through format choice (AVIF, WebP), compression, responsive sizing (srcset), lazy loading, and explicit dimensions — the single highest-impact performance lever for most websites.
2mo ago
performance intermediate
Largest Contentful Paint (LCP)
A Core Web Vital that measures when the largest above-fold content element (typically the hero image or main heading) becomes visible — target under 2.5 seconds. The most impactful page speed metric.
2mo ago
performance intermediate
Resource Hints (preconnect, prefetch, preload)
HTML link attributes that instruct the browser to take early action on resources — opening connections, fetching future pages, or loading critical assets before they are discovered in HTML parsing.
2mo ago
performance intermediate
Caching Strategies
PHP 7.0+
Patterns for when and how to store and invalidate cached data — cache-aside, write-through, write-behind, and read-through each make different trade-offs between consistency, complexity, and performance.
2mo ago
performance intermediate
Redis
PHP 7.0+
An in-memory key-value data store used in PHP applications for caching, session storage, queues, rate limiting, and pub/sub — providing sub-millisecond data access compared to database queries.
2mo ago
performance beginner
Brotli vs gzip Compression
PHP 5.0+
Brotli (br) compresses 15-25% better than gzip for text content — use Brotli for supported browsers (all modern ones), gzip as fallback, both configured at the server level not PHP.
3mo ago
performance intermediate
Cache Warming Strategies
PHP 5.0+
Pre-populating a cache before traffic arrives — preventing the cold-start thundering herd where every request misses a cold cache simultaneously after a deploy.
3mo ago
performance intermediate
HTTP/3 & QUIC
HTTP/3 runs over QUIC (UDP-based) instead of TCP — eliminating head-of-line blocking, reducing connection setup time, and improving performance on lossy networks.
3mo ago
performance advanced
Image Optimisation
PHP 7.0+
Serving images in modern formats (WebP, AVIF), at the correct size, with appropriate compression — typically the single biggest performance win for image-heavy pages.
3mo ago
performance intermediate
PHP Async Frameworks
PHP 8.1+
ReactPHP and Amp provide event-loop async I/O — enabling concurrent HTTP requests without blocking.
3mo ago
performance advanced
Resource Prefetching
HTML5
dns-prefetch, preconnect, preload, and prefetch hints — fetching critical resources early to reduce perceived load time.
3mo ago
performance intermediate
RoadRunner — Persistent PHP Worker
PHP 8.0+
Go-based server keeping PHP workers alive between requests — eliminating per-request bootstrap cost.
3mo ago
performance advanced
Swoole / OpenSwoole
PHP 7.4+
PHP extension with coroutines, async I/O, and built-in HTTP server — handling thousands of concurrent connections in one process.
3mo ago
performance advanced
Worker Pool Patterns
PHP 5.0+
Fixed pool of pre-spawned workers for parallel tasks — avoiding per-task process spawn overhead.
3mo ago
performance advanced
APCu — In-Process User Cache
PHP 5.4+ APCu stores PHP values in shared memory within the PHP-FPM pool — the fastest possible cache with no network hop overhead.
3mo ago
performance intermediate
Asset Versioning & Browser Cache Strategy
Serving static assets with immutable long-lived cache headers plus content-hash filenames — maximising cache hits while guaranteeing instant cache-busting on change.
3mo ago
performance beginner
Async Processing / Job Queues
PHP 5.0+ Deferring time-consuming work (emails, image processing, third-party API calls) to background workers via a queue, improving response times.
3mo ago
performance intermediate